* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Times New Roman', Times, serif;
    background-color: #f7f9fc;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0 10px;
}

/* Main Containers */
.container0 {
    max-width: 550px;
    padding: 30px;
    background-color: #ffffff;
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.08);
    margin: 30px auto;
    border-radius: 8px;
}

.container {
    width: 98%;
    padding: 30px;
    background-color: #ffffff;
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.08);
    margin: 15px auto;
    border-radius: 8px;
}

/* Headings */
h1, h2, h4 {
    text-align: center;
}

h2 {
    margin-bottom: 20px;
    font-size: 1.6em;
    color: #222;
}

/* Form Elements */
label {
    font-size: 1em;
    color: #333;
    display: block;
    margin-bottom: 5px;
}

input {
    font-family: 'Times New Roman', Times, serif;
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: 0.3s;
}

input:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0px 0px 6px rgba(52, 152, 219, 0.4);
}

button {
    font-family: 'Times New Roman', Times, serif;
    width: 100%;
    padding: 10px;
    background-color: #5c9ded;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: 0.3s;
}

button:hover {
    background-color: #4a8cd4;
}

/* Header */
.header {
    background: linear-gradient(90deg, #006cf6, #ff0c00, #0064ff);
    padding: 15px 20px;
    color: white;
    text-align: center;
}

.header img {
    width: 40px;
    margin-right: 10px;
}

h1, h4 {
    margin: 0;
    text-align: center;
}

.logo {
    width: 50px;
    vertical-align: middle;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: center;
    background: linear-gradient(90deg, #006cf6, #ff0c00, #0064ff);
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.1);
    padding: 10px 20px;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.1);

}

.navbar a {
    color: white;
    text-decoration: none;
    padding: 10px 18px;
    font-size: 16px;
    margin: 5px;
    transition: 0.3s;
    /* border-radius: 20px; */
}

/* Hover effect */
.navbar a:hover {
    background-color: #2980b9;
}

/* Active link animation */
.navbar a.active {
    background-color: #2980b9;
    border: 2px solid red;
    animation: borderColorChange 3s linear infinite;
}

@keyframes borderColorChange {
    0%   { border-color: white; }
    25%  { border-color: blue; }
    50%  { border-color: green; }
    75%  { border-color: yellow; }
    100% { border-color: red; }
}

/* Message */
#responseMessage {
    margin-top: 15px;
    color: green;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {

    .container,
    .container0 {
        width: 95%;
        padding: 20px;
    }

    .navbar {
        flex-direction: column;
        align-items: center;
    }

    .navbar a {
        width: 90%;
        text-align: center;
    }
}